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In 2001, centralized perinatal services for women who delivered extremely preterm infants (<27 weeks' gestation) as well as management based on individualized assessment rather than gestational age were recommended in Sweden. To estimate current survival rates of extremely preterm infants, investigators conducted a population-based prospective study of all extremely preterm infants born between April 2004 and March 2007.
Of 305,318 infants who were born in Sweden during the 3-year study, 1011 infants (707 live born, 304 stillbirths) were extremely premature (incidence, 3.3/1000 infants). Seventy percent of extremely premature infants were born at level III hospitals; of these, 75% were transferred while still in utero. Among the 707 live-bor…